Re: [PATCH v2] drm/panel: ronbo-rb070d30: Ignore DCS errors in disable()

[neil.armstrong@linaro.org]

On 10/1/26 02:49, Hsieh Hung-En wrote:
> If rb070d30_panel_disable() returns an error, drm_panel_disable() skips
> clearing panel->enabled. unprepare() still powers the panel off, but the
> next drm_panel_enable() sees the panel as already enabled and does
> nothing, so the panel stays dark.
> 
> Always return 0 from disable(). A failed ENTER_SLEEP_MODE is still logged
> by mipi_dsi_dcs_enter_sleep_mode_multi().
> 
> Suggested-by: Douglas Anderson <dianders@chromium.org>
> Signed-off-by: Hsieh Hung-En <hungen3108@gmail.com>
> ---
> 
> Notes:
>      Changes in v2:
>      - Add a comment explaining why the error is ignored (Doug)
>      
>      This applies on top of:
>      https://lore.kernel.org/all/20260929080143.559685-1-hungen3108@gmail.com/
>      
>      v1:
>      https://lore.kernel.org/all/20260930013029.3241267-1-hungen3108@gmail.com/
>      
>      Compile-tested on arm64 with W=1; not tested on hardware.
> 
>   drivers/gpu/drm/panel/panel-ronbo-rb070d30.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-ronbo-rb070d30.c b/drivers/gpu/drm/panel/panel-ronbo-rb070d30.c
> index ebe6352db..9adf97aba 100644
> --- a/drivers/gpu/drm/panel/panel-ronbo-rb070d30.c
> +++ b/drivers/gpu/drm/panel/panel-ronbo-rb070d30.c
> @@ -87,7 +87,13 @@ static int rb070d30_panel_disable(struct drm_panel *panel)
>   	struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
>   
>   	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
> -	return dsi_ctx.accum_err;
> +
> +	/*
> +	 * Returning an error would leave panel->enabled set, causing the
> +	 * next enable to be skipped even after unprepare powers off the panel.
> +	 * The helper above already logs any command failure.
> +	 */
> +	return 0;
>   }
>   
>   /* Default timings */

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>

Thanks,
Neil